How to disable desktop Chrome inline auto-complete?

This is a common issue, but the Chromium team has always refused to provide a way to disable the inline autocomplete "feature" in Chrome:

"the code and UX complexity of this is nontrivial because inline autocompletion is the central design feature around which all other omnibox decisions are based." https://bugs.chromium.org/p/chromium/issues/detail?id=667922#c8

You should create a report at https://bugs.chromium.org/p/chromium/issues/list (click the "New Issue" button near the logo) to ask for that feature.

Maybe if enough people do that they'll consider providing that option.